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| Subject: | Re: [gislist] "summarize by" question |
| Date: |
04/26/2005 11:20:01 AM |
| From: |
Gregory Yetman |
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Hi Julia,
There's a ESRI technical article on this (number 19184, link below).
Apparently the grid method is more accurate.
Greg
http://support.esri.com/index.cfm?fa=knowledgebase.techarticles.articleShow&d=19184
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Gregory Yetman
Center for International Earth Science Information Network (CIESIN)
Columbia University
URL: http://www.ciesin.columbia.edu/
e-mail: gyetman (at) ciesin.columbia.edu
tel: (845) 365-8982
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On Tue, 26 Apr 2005, Julia Reisemann wrote:
> I have a question regarding the Summarize by in ArcView. I noticed that
> a summarize by on a shapefile gives me higher numbers than summarizing
> the same data as a grid (can be a much as 5%). The file is a parcel
> file, the grid to summarize on has 30m gridcells. Does anybody know,
> why ArcView does this? I assume there is a difference in the algorithm
> or the problem of having a shapely parcel file in contrast to a straight
> forward grid. Would be great, if anybody really knows what is going on.
>
> Thanks,
>
> Julia
>
>
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